#include <stdio.h>
#include <stdlib.h>	/* exit() */
#include <string.h>
#include <pthread.h>
#include <sys/time.h>
#include <time.h>
#include <limits.h>
#include <errno.h>
#include <signal.h>


/*
 * 打印进程ID
 */



int main(void)
{
	printf("hello world from process ID %d\n", getpid());

	exit(0);
}

